Biotransformations in carbohydrates synthesis. N-Acetylgalactosaminyl transfer on to methyl N-acetyl-β-<scp>D</scp>-glucosaminide (methyl 2-acetamido-2-deoxy-β-<scp>D</scp>-glucopyranoside) and methyl N-acetyl-α-<scp>D</scp>-glucosaminide (methyl 2-acetamido-2-deoxy-α-<scp>D</scp>-glucopyranoside) catalysed by a β-N-acetylgalactosaminidase from Aspergillus oryzae
作者:David H. G. Crout、Suddham Singh、Ben E. P. Swoboda、Peter Critchley、Walter T. Gibson
DOI:10.1039/c39920000704
日期:——
Using a crude N-acetylgalactosaminidas fromAspergillusoryzae, the β-N-acetylgalactosaminyl moiety of p-nitrophenyl N-acetylgalactosaminide was transferred to the C-4 and C-6 hydroxy groups of methyl N-acetyl-β-D-glucosaminide and methyl N-acetyl-α-D-glucosaminide and, for the latter, with high efficiency and selectivity for transfer to the C-4 position.
使用粗ñ从-acetylgalactosaminidas米曲霉中,β- Ñ的-acetylgalactosaminyl部分p硝基苯Ñ -acetylgalactosaminide被转移到的甲基的C-4和C-6羟基基团ñ -乙酰基β- d -glucosaminide和甲基N-乙酰基-α - D-氨基葡萄糖,对于后者,具有高效率和选择性,可转移至C-4位。
Di and Tri saccharides, methods of making them and hair growth compositions containing them
申请人:UNILEVER PLC
公开号:EP0528624A1
公开(公告)日:1993-02-24
The preparation of a di or tri saccharide in which at least one glycoside residue bears an acetylamino substituent is catalysed enzymatically using an impure enzyme preparation with N-acetylhexosaminidase activity. The compounds produced, some of which are novel, may be useful to stimulate hair growth.